tests: Add fuzzing harness for CCoinsViewCache

Summary:
Backport of core PR18867.

The sigops count and segwit cases where removed since they are not
applicable to our codebase.

Test Plan:

ninja bitcoin-fuzzers
./src/test/fuzz/coins_view <path_to_corpus>

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D9063